Double venturi tube



Maym17, 1966 D. JAFs 3,251,174

DOUBLE VENTURI TUBE Filed Aug. 27, 1962 3 Sheets-Sheet 1 INVENTOR- DA N/EL JA F5 A T TORNE X Ma u, 1966 D. ms 3, 7

DOUBLE VENTURI TUBE Filed Aug. 27, 1962 5 Sheets-Sheet 2 BQAN/EL JAFS WQQBa ATTORNEX May l7, 1966 D. JAFs DOUBLE VENTURI ,TUBE

5 Sheets-Sheet 3 Filed Aug. 27, 1962 /N VE/VTO/F'. DAN/4 JA F5 5 WZM BAP United States Patent 3,251,174 DOUBLE VENTURI TUBE Daniel Jafs, Warkaus, Finland, assignor to A. Ahlstriim Osakeyhtio, Warkaus, Finland, a corporation of Finland Filed Aug. 27, 1962, Ser. No. 219,522 1 Claim. (Cl. 55-257) The essential part of venturi scrubbers utilized for instance in scrubbing flue gases is constituted by the venturi sion, generally is made of stainless or acid resistant steel,

the production of such a venturi is very costly.

The main object of this invention is to lower the production costs, and besides to produce an efficient venturi scrubber, which is lighter and more sturdy than the type conventionally used.

A further object of the invention is to produce a double venturi tube scrubber, which occupies considerably less space than the conventional combination of two venturi tubes.

In the double venturi scrubber according to this invention the mantle which is open at its both ends, is provided with an intermediate wall, which is essentially inclined disposedwith regard to the longitudinal axis of the mantle, so as to form, inside the mantle, two expanding channels, directed in opposite directions, while the narrow end of one channel is connected to the wide end of the other channel, expanding in the opposite direction, by means of a return bend, and the last mentioned channel is, in its narrow end, provided with a channel, expanding in the opposite direction, and constituting the inlet port of the venturi.

In a preferred embodiment of the invention the shape of the intermediate wall is made such, that it, in the flow directions of each channel, at first is concave and then convex, the change from concave to convex taking place at the centerline of the mantle.

It has proved advantageous to provide the return bend with one or more leading bailles or intermediate walls, Which serve to lead the gas flow from the first venturi to the second.

If the mantle is made essentially cylindrical, a very simple and easily manufactured venturi is obtained, which, moreover, needs only about 60% of the space a conventional venturi needs.

Both channels are in addition, in their narrow points, provided with liquid jet orifices and with drop separators,

which preferably are situated between the two channels and in the outlet port of the second channel.

Further advantages of the invention will be apparent from the following description, in which, with reference to the accompanying drawings, one embodiment of the double venturi tube according to the invention is set forth by way of an example.

In the drawings:

FIG. 1 shows the double venturi tube scrubber according to the invention, in side elevation,

FIG. 2 shows the same seen from above,

FIG. 3 is a section of FIG. 2 taken on the line 3-3,

FIG. 4 is a section of FIG. 2, taken on the line 44,

FIG. 5 is a section of FIG. 2, taken on the line 5--5,

FIG. 6 shows the double venturi tube scrubber of FIG. 1, seen from the inlet end, and

FIG. 7 is a view in top perspective of the intermediate wall 17 of the illustrative double venturi tube scrubber.

3,251,174 Patented May 17, 1966 In the drawings the reference number 1 indicates a cylindrical outer mantle, which, at its inside is divided into two channels 3 and 4, expanding in opposite directions by means of an intermediate wall 2. In the drawings FIGS. 1 and 2, some conjunction lines of the intermediate wall 2 and the cylindrical mantle 1 are indicated by dotted lines. nected through the drop separator 5 to the narrow end of channel 4. The drop separator 5 is of a type, which is known as such, and which is generally used in connection with venturi tubes, and which therefore is not described in detail in this connection, because it has to be considered to be known as to its structure to those versed in the art, and because it as such is not an object of the invention.

At the narrow end of channel 4 there is adapted, for instance by welding, a short collar part 6, expanding in the opposite direction with regard to channel 4, which part 6 is in the drawings, FIGS. 1 and 2, shown by dotted lines. At the wide end of channel 4, which at the same time constitutes the outlet end of the double venturi tube, a drop separator 7 is adapted, of a type known as such.

At the narrow end of channel 3, beside the drop separator 7, situated at the outlet end of the double venturi scrubber, there is the inlet end 8 of the double venturi tube, which inlet end is constituted by a tube or collar tapering towards thechannel 3, and which in the embodiment according to the drawing partly intersects the mantle of drop separator 7.

Near the narrow ends of both channels 3 and 4 are adapted the liquid jet orifices 9 and 10, which consist of the feeding tubes 11 and 12 respectively, the ring mains 13 and 14, and the jet orifices 15 and 16 respectively.

In the embodiment according to the drawings the intermediate wall 2, separating the channels 3 and 4 from each other, is made of five parts 17, 18, 19, and 21, which are joined, for instance by welding, to each other and to mantle 1. In FIGURE 1 the dotted lines 22 and 23 limit the part 17, the part 18 is limited by the dotted lines 22 and 24, the part 19 by the dotted lines 22 and 25, the part 20 by the dotted lines 22 and 26, and the part 21 is limited by the dotted lines 23 and 27. The dotted lines 22 and 23 indicate the joining seams along which the parts 18, 19, 20 and 21 are joined to the part 17. The dotted line 24 indicates the joining seam between the part 18 and the mantle 1, while the dotted line 25 shows the joining seam between part 19 and the mantle 1. The parts 17, 18 and 19 are also joined to the feeding end 8 along the seam 28. The dotted line 26 indicates the joining seam between the part 20 and the mantle 1, while the dotted line 27 indicates the joining seam between the part 21 and the mantle 1. The parts 17, 20 and 21 are also joined to the collar part 6 along the seam 29.

At the lower ends 30 and 31 of the conical lower parts of both drop separators 5 and 7 there are drain tubes 32 and 33 for the liquid. The scrubbed gases leave the drop separator 7 at its upper end through the pipe 34.

The double venturi scrubber structure described above and shown in the drawings is given only by Way of an example and it can naturally in its different details be varied and altered without exceeding the inventional principle and the protective scope of the accompanying claim.

What I claim is:

A double venturi tube gas scrubber comprising an elongated hollow cylindrical housing having a longitudinal axis, an intermediate wall extending longitudinally within the housing, said wall having opposite end edges and opposite side edges, said wall sealed at its side edges to the housing to divide the space within the housing into two adjoining channels isolated from each other, all points of said side edges lying on the inner surface of said hous- The wide end of the channel 3 is con- 3 ing, the channels together with the intermediate wall occupying at least substantially the entire space within the housing, said housing having a first end and a second end, said channels each having an entrance end and a discharge end, one of said channels having its entrance end disposed at the first end of said housing and its discharge end disposed at the second end of said housing, the other of said channels having its entrance end disposed at the second end of said housing and its discharge end disposed at the first end of said housing, said one of said channels increasing in cross sectional area from its entrance end to its discharge end, the other one of said channels increasing in cross sectional area from its entrance end to its discharge end, first conduit means joined to the first end of the housing for introducing a gas to be scrubbed into the entrance end of said one channel, second conduit means joined to the second end of the housing for conducting gas delivered from the discharge end of said one channel into the entrance end of said other channel, third conduit means joined to the first end of said housing for removing gas from the discharge end of said other channel, means constructed and arranged in said entrance end of each of said channels for spraying liquid toward the discharge end of each channel respectively, a gas conducting collar joined to said first entrance end of said other channel, said collar and said first conduit means converging in directions opposite to the direction of convergence of the respective channels, a drop separator joined to the discharge larger end of each of the channels, means joined to each drop separator for removing separated liquid, and the portion of each opposite side edges adjacent and proximate to one of said end edges being curved toward each other to form a circular narrow inlet for said one channel, the portion of said opposite side edges adjacent and proximate to the other one of said end edges being curved toward each other to form a circular narrow inlet for said other channel, the bending of the side edges of said wall at said one end edge of said wall being in a direction opposite from the direction of bending at said other end edge of said wall.

References Cited by the Examiner UNITED STATES PATENTS 703,048 6/1902 Donohue 2611 17 816,371 3/1906 Platz 261117 934,205 9/1909 Nix 2611l6 1,979,189 10/1934 Bowers 55257 2,032,404 3/1936 Fisher 261116 2,060,166 11/1936 Bowen 261-118 2,174,060 9/1939 Niehart 55357 X 2,267,426 12/1941 Saunders et al 55257 X 2,385,077 9/1949 Harker et a1 261-118 2,579,282 12/1951 Vicard 55--256 2,797,904 7/ 1957 Voorheis 261-118 X 2,906,511 9/1959 Umbricht et al 55257 X 2,935,375 5/1960 Boucher 55257 X 3,029,578 4/1962 Wiemer et a1 55257 X FOREIGN PATENTS 604,514 1/1926 France. 1,281,580 5/1960 France.

305,511 11/1919 Germany.

4,386 12/ 1874 Great Britain. 5,689 8/ 1901 Great Britain. 28,295 12/1904 Great Britain.

HARRY B. THORNTON, Primary Examiner.

5 ROBERT F. BURNETT, Examiner. 

